Evaluation Of Cyclic Strength Research Articles

Justifying the Vibration Resistance of Pipelines of NPPS

The NP-096-15 regulations require the design documentation for NPP pipelines to justify life characteristics and life evaluation criteria and to provide monitoring of such characteristics of pipelines during their entire service life. A review of strength design regulations regarding the justification of the vibration resistance of NPP pipelines shows that the evaluation of their damage is based on a limited spectrum of dynamic stress amplitudes, which affects the accuracy of the evaluation of cyclic strength. Amethodological approach to the justification of the vibration resistance of pipelines is developed and tested in industrial conditions. The approach is based on a stress-based failure criterion and a mathematical model describing the vibrations of pipelines with allowance made for the effect of the flow on the wall based on the local isotropic theory of turbulence.

Computational Evaluation of Cyclic Strength of Carburized Gears from Heat-Resistant Steels

An advanced model for computing the fatigue bending strength of gears fabricated from a complexly alloyed heat-resistant steel 16Kh3NVFMB-Sh (VKS-5) subjected to vacuum carburizing in acetylene is suggested. The model matches experimental data satisfactorily and has been used to develop a mode for vacuum carburizing of gears from the heat-resistant steel to provide a high fatigue resistance.

中空ねじりせん断によるセメント改良砂の繰返し強度・変形特性-繰返し強度の評価-

中空ねじりせん断によるセメント改良砂の繰返し強度・変形特性-繰返し強度の評価-

Closure to “ Statistical Evaluation of Cyclic Strength of Sand ” by Achintya Haldar and Frank J. Miller (December, 1984)

Closure to “ <i>Statistical Evaluation of Cyclic Strength of Sand</i> ” by Achintya Haldar and Frank J. Miller (December, 1984)

Discussion of “ Statistical Evaluation of Cyclic Strength of Sand ” by Achintya Haldar and Frank J. Miller (December, 1984)

Discussion of “ <i>Statistical Evaluation of Cyclic Strength of Sand</i> ” by Achintya Haldar and Frank J. Miller (December, 1984)

Statistical Evaluation of Cyclic Strength of Sand

A statistical model is proposed to estimate the cyclic shear strength of a saturated sand deposit. Large-scale shaking table test results are used to develop the basic model since they reproduce the in situ test conditions more closely than other laboratory tests. Due to the unavailability of large-scale shaking table test results for different soils and test conditions, cyclic triaxial test results are used to modify this basic model. The model is first developed to represent laboratory conditions. This laboratory relationship is then modified for in situ conditions. Factors affecting laboratory relationships that are considered in this study are methods of sample preparation, soil fabric, system compliance, mean grain size, multidirectionality of earthquake motions, and secondary factors. Factors affecting the in situ relationship are previous strain history, age, cementation, etc. It is observed that considerable uncertainty is expected in the estimation of the in situ cyclic shear strength. The uncertainty associated with the in situ relative density contributes significantly to the overall uncertainty. This type of uncertainty needs to be considered in any analysis where the cyclic shear strength of sand is an important parameter, e.g., liquefaction.